Nano/Microtribological Properties of Ultrathin Functionalized Imidazolium Wear-Resistant Ionic Liquid Films on Single Crystal Silicon |
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Authors: | Yufei Mo Wenjie Zhao Min Zhu Mingwu Bai |
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Affiliation: | (1) State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, 730000, China;(2) Graduate School of Chinese Academy of Sciences, Beijing, 100039, China |
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Abstract: | Ionic liquids (ILs) are considered as a new kind of lubricant for micro/nanoelectromechanical system (M/NEMS) due to their
excellent thermal and electrical conductivity. However, so far, only few reports have investigated the tribological behavior
of molecular thin films of various ILs. Evaluating the nanoscale tribological performance of ILs when applied as a few nanometers-thick
film on a substrate is a critical step for their application in MEMS/NEMS devices. To this end, four kinds of ionic liquid
carrying methyl, hydroxyl, nitrile, and carboxyl group were synthesized and these molecular thin films were prepared on single
crystal silicon wafer by dip-coating method. Film thickness was determined by ellipsometric method. The chemical composition
and morphology were characterized by the means of multi-technique X-ray photoelectron spectrometric analysis, and atomic force
microscopic (AFM) analysis, respectively. The nano- and microtribological properties of the ionic liquid films were investigated.
The morphologies of wear tracks of IL films were examined using a 3D non-contact interferometric microscope. The influence
of temperature on friction and adhesion behavior at nanoscale, and the effect of sliding frequency and load on friction coefficient,
load bearing capacity, and anti-wear durability at microscale were studied. Corresponding tribological mechanisms of IL films
were investigated by AFM and ball-on-plane microtribotester. Friction reduction, adhesion resistance, and durability of IL
films were dependent on their cation chemical structures, wettability, and ambient environment. |
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Keywords: | Ionic liquid Lubricant Thin film Atomic force microscopy Friction Wear |
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